Honestly my favorite of the Jam so far. It just works really well. At first I thought it was weird that holding your breath while moving was so effective, but it lead to a really cool fast-paced stealth system that I really enjoyed. I loved ducking and weaving through the crowds and progressing through the levels.
The sound was minimal but effective, and I loved that when I heard a ton of footsteps, I had to figure out if it meant there was a ton of enemies, or that I was actively being chased, which was super tense!
The only things I would add would be some sort of timer, so people don't stick around on a level and instead play fast and loose while balancing breath. and sometimes when passing through doorways, the wall obscures my vision so I can't see if an enemy is going to tackle me when I pass through. Not sure how you would fix that but it's something to note.
Seriously though, hats off to you. This was really impressive to pull off in the time period.